1 Division of Neurology (I.H., H.J.M.), Children's Hospital of Eastern Ontario, Children's Hospital of Eastern Ontario Research Institute (H.J.M., Y.I., D.A.D.), University of Ottawa; Newborn Screen Ontario (K.D.K.), Ottawa; Department of Clinical Genetics (J.L., D.A.D.), and Division of Metabolics (M.A.L.), Children's Hospital of Eastern Ontario, University of Ottawa.